What does this symbol mean? (Infinity with a square)?

[astrothree]

I'm really into symbolism but I have no idea what this symbol is! I saw it on a necklace, if anyone has any inkling as to what it means I'd appreciate it. :]

http://img.photobucket.com/albums/v169/itssabotage/wtf-1.jpg

 

[Sizzla]

im not sure